CN111837056A

CN111837056A - Cooling device

Info

Publication number: CN111837056A
Application number: CN201980016449.8A
Authority: CN
Inventors: J·奥利韦拉; J·科斯塔; J·桑托斯; A·霍莱切克
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2018-03-01
Filing date: 2019-02-04
Publication date: 2020-10-27
Also published as: WO2019166180A1; EP3759519B1; US20210051821A1; US12010822B2; EP3759519A1; DE102018203075A1

Abstract

According to the invention, a cooling device (1) is proposed, comprising at least a housing frame (10), a heat exchanger (20), an electrically drivable fan unit (30), a control unit (40) and a sensor unit (50). The housing frame (10) can be arranged in particular on a first surface of the heat exchanger (20). A fan unit (30), for example a fan or a blower, is arranged in such a way that, when the fan unit (30) is in operation, a first air flow (60) is generated in the direction of the first surface (22) of the heat exchanger (20). The fan unit (30) is received, for example, in a recess (18) of the housing frame (10). According to the invention, the housing frame (10) has at least one air channel (12) having an air inlet opening (14) and an air outlet opening (16), wherein the air channel (12) is designed parallel to the first surface (22) of the heat exchanger (20) such that a second air flow (70) along the first surface (22) can be guided through the air channel (12). At least one measurement variable can be sensed by means of the sensor unit (50) and the fan unit (30) can be actuated by means of the control unit (30) as a function of the sensed at least one measurement variable.

Description

Cooling device

Technical Field

The invention relates to a cooling device, which is designed in particular for cooling an environmental sensor of a motor vehicle. The invention also relates to a method for cooling a heat sink, in particular an environmental sensor, of a motor vehicle, a vehicle and a lidar sensor having a cooling device.

Background

US 4,884,631 discloses a cooling arrangement in which air flow is directed along a plurality of paths through a cooling structure. The cooling structure has cooling ribs or cooling honeycombs.

US 6,305,463B 1 discloses a cooling device for a circuit board module. The cooling device has a liquid cooling section and an air cooling section. The sections can be used independently of one another and are arranged such that the cooling device can be used for different applications depending on the required cooling power of the specific application. It is also possible to use both an air cooling section and a liquid cooling section.

US 7,652,880B 2 describes a cooling device in which both natural convection and air flow generated by a fan are used for cooling. To this end, the cooling device has a cooling body with cooling ribs and a plurality of air channels, and at least one fan. Cooling devices with cooling ribs are typically designed to be cooled using natural convection, forced air flow, or a combination of both.

In use in a motor vehicle, however, special consideration may be given to situations in which an external air flow generated by the movement of the vehicle is additionally required for sufficient cooling.

One example is a sensor unit of a vehicle, for example an environmental sensor, which generates heat by its electronic components themselves and has to be cooled, and which is fixed close to the engine compartment of the vehicle. In the case of internal combustion engines, temperatures of up to 140 ℃ can occur in this region. When, due to the sun incidence, there is additionally an external high temperature and the vehicle is stopped with the engine running or is only moving slowly forward, for example when the vehicle is in traffic congestion, the cooling by the external air flow (the driving wind) is no longer sufficient. The sensor unit must be adjusted to operate to avoid damage due to overheating of the electronic components or sensor elements.

The use of cooling devices according to the prior art makes it possible to eliminate said problems by using electrically driven fans in order to remove heat by convection even in the absence of an external air flow. A disadvantage of this system is that the fan is in continuous operation and consumes energy to ensure sufficient cooling of the sensor unit even in the presence of sufficient driving wind.

Disclosure of Invention

According to the invention, a cooling device is proposed, which comprises a housing frame, a heat exchanger, an electrically drivable fan unit, a control unit and a sensor unit. Furthermore, the cooling device may contain further functional units, such as pressure compensation elements, connections, etc. The housing frame can in particular be arranged on a first surface of the heat exchanger. The fan unit, for example a fan or a blower, is arranged such that, when the fan unit is in operation, a first air flow is generated in the direction of the first surface of the heat exchanger. The fan unit is received in a recess of the housing frame, for example. According to the invention, the housing frame has at least one air channel with an air inlet opening and an air outlet opening, wherein the air channel is designed parallel to the first surface of the heat exchanger, so that a second air flow along the first surface can be guided through the air channel. At least one measured variable can be sensed by means of the sensor unit and the fan unit can be actuated by means of the control unit as a function of the at least one sensed measured variable.

The invention thus makes it possible to provide a cooling device which can be automatically switched between active and passive cooling operation, for example, depending on the current temperature of the surface to be cooled. This makes it possible to shut down the fan unit, for example, when the external second air flow is sufficient for bringing about the required cooling power. This advantageously makes it possible to use external conditions, such as the wind of a vehicle, to achieve effective cooling without the fan unit having to be operated continuously.

The following advantages result in particular for the use of the cooling device according to the invention in a motor vehicle: the appliance to be cooled can be arranged more flexibly with respect to the installation location on the vehicle. This also allows, for example, an arrangement in the region of the engine compartment. In particular, for cooling environmental sensors of a vehicle, for example lidar sensors which generate a high heat extraction, for example up to 120W, the cooling device according to the invention can be used advantageously and allows an improved and more flexible installability of such sensors on a vehicle. The cooling device according to the invention is compact, modular and integrates all the required components.

Preferably, the housing frame is placed onto the heat exchanger, whereby a compact and stable construction of the cooling device is obtained.

In a preferred embodiment, the first surface of the heat exchanger has a plurality of cooling ribs, which are oriented in particular along the air channels. Thereby further improving the cooling power.

Preferably, the sensor unit has at least one temperature sensor. The temperature of the heat exchanger is sensed as a measured variable by a sensor unit and the fan unit is actuated as a function of the sensed temperature.

In a possible embodiment of the invention, the housing frame is made of a material having a thermal conductivity of less than 15W/mK. This prevents the housing frame from becoming increasingly hot and damaging the fan unit and/or the control unit as a result of the heating. Furthermore, such materials, such as plastics, are generally lighter than materials having a higher thermal conductivity.

Preferably, the heat exchanger is made of a material with a thermal conductivity of more than 50W/mK in order to efficiently dissipate heat.

By the modular design of the separate heat exchanger and the housing frame, different materials can advantageously be used for the construction of the cooling device, so that overall a lighter and more cost-effective design is obtained compared to the prior art.

According to a second aspect of the invention, a method for cooling a heat-emitting device, in particular an environmental sensor of a motor vehicle, is proposed, in which method a cooling device implemented as described above is used. In this case, at least one measurement variable, in particular the temperature and/or the flow speed, is sensed by means of a sensor device, and the fan unit is actuated as a function of the sensed at least one measurement variable. Thus, a first air flow is generated by the fan unit, which first air flow is directed in the direction of the first surface of the heat exchanger. In the event of a movement of the cooling device in a predetermined direction, a second air flow is generated through the air channel by said movement.

According to a further aspect of the invention, a vehicle is proposed. The vehicle has a heat-emitting means, in particular an environmental sensor, arranged on the vehicle and a cooling device constructed according to the invention. A second surface of the heat exchanger of the cooling device, which is opposite to the first surface of the heat exchanger of the cooling device, is arranged in electrically conductive thermal contact with the heat spreader. The cooling device is oriented such that a second air flow is generated through the outside of the at least one air channel of the cooling device by the forward movement of the vehicle. In particular, the heat exchanger can be designed, for example, integrally with the housing of the heat-emitting means.

The cooling device or the heat-emitting means in heat-conducting contact with the heat exchanger of the cooling device can in principle be arranged at any location on the vehicle. It is only necessary that the air passage is oriented in the direction of the traveling wind when the vehicle is moving forward. The heat-emitting means and/or the cooling device may be arranged, for example, on the roof of the vehicle. The heat-emitting means and/or the cooling device can be arranged, for example, in the region of a bumper at the front of the vehicle. In this case, the heat-emitting means and/or the cooling device can be arranged, for example, at least partially in the engine compartment and/or next to the engine compartment of the vehicle.

The cooling device can be placed, for example, modularly on the housing of the heat-emitting device when the heat-emitting device is installed in or on a vehicle. Alternatively, the cooling device may be mounted integrally with the heat emitting appliance.

The heat-emitting means is designed, for example, as a lidar sensor. Lidar sensors are preferred for environmental sensing, especially for autonomous driving functions and driver assistance functions. Lidar sensors typically implement one or more laser diodes which, in combination with their drive circuitry, typically generate high heat extraction and must be cooled.

According to the invention, an environmental sensor, in particular a lidar sensor, is also proposed, which has at least one cooling device as described above.

In a preferred embodiment, the lidar sensor has at least two cooling devices according to the invention.

In a preferred embodiment, the heat exchanger is integrated into the housing of the lidar sensor, in particular the lidar sensor, and the housing frame is placed onto the heat exchanger. This is particularly advantageous, since the cooling of the lidar sensor can be configured very efficiently by the direct connection and thus the low thermal resistance.

In an alternative embodiment, the heat exchanger can be designed separately and placed, for example, on the heat-emitting outer side of the lidar sensor.

Lidar sensors typically have a housing within which sensor electronics and optics are received. The housing may comprise a measurement window through which light may reach the environment and/or may receive reflected light from the environment. According to the invention, the housing can have one or more cooling devices constructed according to the invention.

In an alternative embodiment, the lidar sensor may be configured such that a camera unit, which represents the receiver of the lidar sensor, and one or more illuminators, which in particular have separate housings, are separately provided for emitting light into the environment of the lidar sensor. The camera unit and/or the illumination device can each have one or more cooling devices constructed according to the invention for cooling purposes.

The invention in all its aspects enables intelligent cooling solutions which allow automatic switching between active and passive cooling modes and which regulate the active cooling mode in such a way that an optimized cooling capacity is always achieved. This makes it possible, in particular, to not activate the active cooling mode in the presence of a sufficient external air flow.

Drawings

FIG. 1 shows a possible embodiment of a cooling device according to the invention in a plan view

FIG. 2 shows the cooling device according to FIG. 1 in an oblique view

Fig. 3a) to c) each show a section through the cooling device according to fig. 1, wherein different operating states of the cooling device are shown.

FIG. 4 shows a flow diagram of a method for cooling an exothermic appliance, according to a possible embodiment of the present invention.

FIG. 5 shows a vehicle having an environmental sensor and a cooling device constructed in accordance with the invention.

FIG. 6 illustrates an embodiment of a lidar sensor configured according to the present disclosure.

Detailed Description

In the following description of the embodiments of the present invention, the same elements are denoted by the same reference numerals, and repeated description of the elements is omitted as necessary. The figures only schematically illustrate the subject matter of the invention.

A possible embodiment of a cooling device 1 according to the invention is shown in top view in fig. 1. Fig. 2 shows a cooling device 1 of the same construction in an oblique view.

The cooling device 1 comprises a housing frame 10 which is placed onto the heat exchanger 20 and partly laterally beyond the heat exchanger. In this example, the heat exchanger 20 is configured in the form of a cooling plate and has a first surface 22, which faces the housing frame 10. In the housing frame 10, an electrically drivable fan unit 30 and a control unit 40 are received in the

recesses

18, 19 of the housing frame 10, respectively. The fan unit 30 is arranged such that when the fan unit is operated a first air flow 60 is generated in a direction towards the first surface 22 of the heat exchanger 20. In this example, the first surface 22 of the heat exchanger 20 is covered by the housing frame 10 and has a plurality of cooling ribs. The housing frame 10 has an air inlet opening 14 on one side and an air outlet opening 16 on the opposite side. This forms an air duct 12 which runs parallel to the first surface 22 of the heat exchanger 20. The second air flow 70 may be directed through the air channel along the first surface 22. The second air flow 70 is also referred to as external air flow, since it is not generated by the fan unit 30, but for example by a movement in a direction corresponding to the air passage 12. The cooling device 1 further comprises a sensor unit 50 which senses at least one measurement variable, for example the temperature of the heat exchanger 20. The sensor unit 50 can be integrated into the control unit 40 or arranged separately on the heat exchanger 20, for example. The control unit 40 is configured for operating the fan unit 30. According to the invention, the fan unit 30 is actuated by means of the control unit 40 as a function of the at least one measured variable sensed by the sensor unit 50. Thus, the fan unit 30 can be in operation only, for example, if the temperature of the heat exchanger 20 exceeds a certain limit value. For example, the rotational speed of the fan unit can also be adjusted as a function of the measured variable. For example, thermocouple elements or other known sensors for temperature measurement can be used as sensor unit 50.

The housing frame 10 preferably comprises a material having a relatively low thermal conductivity, in particular less than 15W/Km, in order to avoid damage due to overheating at the fan unit 30 and/or the control unit 40 and to save weight. Such a material may be, for example, a plastic, such as polypropylene.

The heat exchanger 20 preferably comprises a material with a relatively high thermal conductivity, in particular greater than 50W/Km, in order to efficiently conduct heat away from the surface to be cooled. Such a material may be, for example, a metal such as aluminum or copper or a special ceramic or alloy. Preferably, the cooling device 1 is mounted such that a second surface 23 of the heat exchanger 20, opposite the first surface 22, is in thermal contact with the surface to be cooled.

The fan unit 30 is preferably received in the recess 18 of the housing frame 10 such that the frame 31 of the fan unit 30 is oriented parallel to the direction of the external air flow 70. This prevents fan blades 32 from being damaged by external air flow 70 in the rest state of fan unit 30.

The control unit 40 is preferably arranged in a sealed chamber inside the recess 19 of the housing frame.

In fig. 2, a first air flow 60 is schematically shown, which is generated by the fan unit 30 and which is directed in the direction of the first surface 22 of the heat exchanger 20. The air flow 60 generates vortices in the region of the first surface 22, which increase the heat dissipation. The first air flow 60 can escape, for example, through the air outlet opening 16 of the housing frame 10. When no external air flow 70 is present, the first air flow 60 may also escape through the air inlet opening 14 of the housing frame 10.

Fig. 3 shows the cooling device 1 according to the embodiment of fig. 1 and 2 in cross section, wherein a cross section along a section line 80 in the region of the fan unit of fig. 2 is shown. It is clear here that in this exemplary embodiment the housing frame 10 is arranged on the heat exchanger 20 in such a way that the housing frame 10 rests on the heat exchanger 20, in particular on the cooling ribs 24 at the edge of the heat exchanger 20. For this purpose, the housing frame has projections 11 at two opposite sides, so that the heat exchanger 20 can be inserted into the housing frame 10.

Fig. 3a) shows a first operating mode of the cooling device 1. In this first mode of operation, the fan unit 30 is not operating. The outer second air flow 70, which is generated, for example, by the movement, flows through the air duct 12 formed between the housing frame 10 and the heat exchanger 20, the air flow 70 running in particular in the intermediate spaces 25 between the cooling ribs 24. The cooling power in this first mode of operation depends on the characteristics of the outside air flow 70. This so-called passive operating state is set when the external air flow 70 is sufficient for achieving the desired cooling of the heat exchanger, in particular of the first surface 22 and/or the second surface 23.

Fig. 3b) shows a second operating mode of the cooling device 1. In this second operating mode, the fan unit 30 additionally operates. A first air flow 60 is generated by the fan unit 30, which is directed onto the first surface 22 of the heat exchanger 20. The external second air flow 70, which is generated, for example, by movement, additionally flows through the air duct 12 formed between the housing frame 10 and the heat exchanger 20. The first air stream 60 is directed substantially perpendicular to the second air stream 70. The cooling power in this first mode of operation depends on the characteristics of the external air flow 70 and the first air flow 60 generated by the fan unit 30. This second operating state is set when the external air flow 70, although present, is not sufficient on its own to achieve the desired cooling of the heat exchanger, in particular of the first surface 22 and/or the second surface 23. The fan unit 30 is correspondingly controlled by means of the control unit 40, for example, by adapting the rotational speed. The regulation is carried out as a function of the sensed measurement variable, in particular the temperature of the first surface 22 and/or the second surface 23 of the heat exchanger.

Fig. 3c) shows a third operating mode of the cooling device 1. In this second operating mode, no or only a negligible external second air flow is present. The fan unit 30 is operated. A first air flow 60 is generated by the fan unit 30, which is directed onto the first surface 22 of the heat exchanger 20. The cooling power in this first mode of operation depends on the characteristics of the first air flow 60 generated by the fan unit 30. This third operating state is set when, for example, no or only a negligible external air flow is present in the stationary state or in very slow movements. The fan unit 30 is correspondingly controlled by means of the control unit 40, for example, in such a way that the rotational speed is adapted, wherein the rotational speed in the third operating mode is in particular higher than in the second operating mode. Here, the regulation is also carried out as a function of the sensed measured variable, in particular the temperature of the first surface 22 and/or the second surface 23 of the heat exchanger.

FIG. 4 schematically illustrates a flow diagram of a method for cooling an exothermic appliance, according to a possible embodiment of the present invention. The heat-emitting means can be, in particular, an environmental sensor of a motor vehicle, particularly preferably a lidar sensor. The method uses, for example, a cooling device 1, which is constructed as shown in fig. 1 to 3.

In a first method step 100, a measurement variable, in particular a temperature and/or a flow rate, is sensed by means of at least the sensor device 50 of the cooling device 1 used. Such as sensing the surface temperature of the heat exchanger 20. The temperature on the first surface 22 and/or the second surface 23 of the heat exchanger 20 may be sensed.

In a subsequent step 110, the fan unit 30 of the cooling device 1 is actuated as a function of the measured variable sensed in step 100. If the measurement of the temperature, for example, results in a measured variable, in particular the sensed temperature of the heat exchanger 20, exceeding a first defined threshold value, the fan unit 30 can be put into operation and a first air flow 60 can be generated by the fan unit 30. The sensing of the measured variable according to step 100 is performed continuously. If during a number of measurement periods, for example, an elevated temperature is sensed, the rotational speed of the fan unit 30 may be increased in step 110. If the temperature sensed in step 100 is, for example, below a second threshold, then the fan unit 30 may not be activated in step 100. In the case 120 of a movement of the cooling device 1, the second air flow 70 is generated in a predetermined direction through the air duct 12 of the cooling device 1.

The movement 120 of the cooling device 1 and the resulting second air flow 70 influence the measured variable sensed in step 100 and thus also the actuation of the fan unit 30 performed in step 110. If, for example, there is no movement 120 and thus no second air flow 70, the temperature of the heat exchanger 20 sensed in step 100 may be significantly higher than in the case where there is a significant second air flow 70. As a result, the fan unit 30 must be operated at a higher speed in step 110 than when no significant second air flow 70 is present. If, however, the second air flow 70 is present, the fan unit may not be operated at all or only at a low rotational speed in step 110.

Fig. 5 shows the front of a vehicle 200, with a heat-emitting means 210 arranged on the vehicle, which is arranged in the region of a bumper 205 of the vehicle 210, in particular above the bumper 205, for example centrally between the headlights. The device 210 is in particular an environmental sensor, such as a lidar sensor, having associated power electronics. Furthermore, the vehicle 200 has a cooling device 1, which is configured, for example, as already explained in connection with fig. 1 to 3. A second surface 23 of the heat exchanger 20 of the cooling device 1, which is opposite the first surface 22 of the heat exchanger 20 of the cooling device 1, is arranged in heat-conducting contact with the heat sink 210, wherein the cooling device 1 is arranged in such a way that, by a forward movement of the vehicle 200 (indicated by an arrow 220), an air flow 230 is guided through the at least one air channel 12 of the cooling device 1 and thus forms an external second air flow 70. In the illustrated arrangement of the lidar sensor 210 in the region of the bumper 205, the use of the cooling device 1 according to the invention is particularly advantageous, since the lidar sensor is exposed to the exhaust heat of the engine. Alternatively or additionally, a heat-emitting means 210 ', for example an additional or alternatively arranged lidar sensor, with a cooling device 1' according to the invention may also be arranged on the roof 207 of the vehicle 200. The cooling device 1 'is likewise oriented in such a way that the air flow 230 is guided by the forward movement of the vehicle 200 through the at least one air channel of the cooling device 1' and thus forms the external second air flow 70. Additional, alternative mounting locations of the heat-emitting appliance with the cooling device according to the invention on the vehicle 200 are conceivable.

In fig. 6, a lidar sensor 300 according to a possible embodiment of the invention is shown. Lidar sensor 300 has a housing 310, inside which sensor electronics and optics are received, and a measurement window 320. The housing 310 is substantially square. The two

cooling devices

1a and 1b are arranged on

opposite sides

312 and 314 of the housing 310. Here, the side faces 312 and 314 form heat exchangers of the

cooling devices

1a and 1 b. Thus,

cooling devices

1a and 1b are configured integrally with housing 310 of lidar sensor 300. The

cooling devices

1a and 1b are oriented in such a way that, when the lidar sensor 300 is moved, an external air flow 70 is generated in a predetermined direction through each of the

cooling devices

1a, 1 b.

Claims

1. Cooling device (1) comprising at least a housing frame (10), a heat exchanger (20), an electrically drivable fan unit (30), a control unit (40) and a sensor unit (50), wherein the fan unit (30) is arranged such that, when the fan unit (30) is in operation, a first air flow (60) is generated in the direction of a first surface (22) of the heat exchanger (20), characterized in that the housing frame (10) has at least one air channel (12) having an air inlet opening (14) and an air outlet opening (16), wherein the air channel (12) is configured parallel to the first surface (22) of the heat exchanger (20) such that a second air flow (70) along the first surface (22) can be conducted through the air channel (12), wherein at least one measurement variable can be sensed by means of the sensor unit (50) and a second air flow (70) along the first surface (22) can be conducted by means of the control unit (50) A control unit (40) is capable of actuating the fan unit (30) as a function of the sensed at least one measured variable.

2. A cooling device (1) as in claim 1, characterized by the housing frame (10) being releasably mechanically connected with the heat exchanger (20).

3. The cooling device (1) according to claim 1, characterized in that the heat exchanger (20) is connected in a form-fitting manner to a heat-emitting means (210), in particular to a housing (310) of an environmental sensor (300).

4. A cooling device (1) according to any of claims 1-3, characterized in that the fan unit (30) is received in a recess (18) of the housing frame (10).

5. A cooling arrangement (1) according to any of the preceding claims, characterized in that the first surface (22) of the heat exchanger (20) has a plurality of cooling ribs (24).

6. A cooling device (1) as in claim 5, characterized by the cooling ribs (24) being oriented along the air channel (12).

7. The cooling device (1) according to any one of the preceding claims, wherein the sensor unit (50) has at least one temperature sensor.

8. Cooling arrangement according to claim 7, characterized in that the temperature of the heat exchanger (20) or the surface to be cooled can be sensed as a measured variable by means of the sensor unit (50).

9. A cooling arrangement according to any one of the foregoing claims, characterised in that the housing frame (10) is of a material having a thermal conductivity of less than 15W/mK.

10. A cooling arrangement according to any one of the foregoing claims, characterised in that the heat exchanger (20) is of a material having a thermal conductivity of more than 50W/mK.

11. Method for cooling a heat-emitting appliance (210), in particular an environmental sensor (300) of a motor vehicle (200), which is carried out using a cooling device (1) according to one of claims 1 to 10, wherein,

-sensing at least one measurement variable, in particular temperature and/or flow speed, by means of the sensor device (50),

-operating the fan unit (30) as a function of the sensed at least one measured variable and generating a first air flow (60) by the fan unit (30),

-generating a second air flow (230, 70) through the air channel (12) with the cooling device moving in a predetermined direction (220).

12. Vehicle (200) having at least one heat-emitting means (210, 210 '), in particular an environmental sensor (300), arranged thereon and at least one cooling device (1, 1') according to one of claims 1 to 9, wherein a second surface (23) of the heat exchanger (20) of the cooling device (1), which is opposite the first surface (22) of the heat exchanger (20) of the cooling device (1, 1 '), is arranged in heat-conducting contact with the heat-emitting means (210, 210'), wherein the cooling device (1, 1 ') is oriented such that a second, external air flow (230, 70) through the at least one air channel (12) of the cooling device (1, 1') is generated by a forward movement of the vehicle (200).

13. The vehicle (200) of claim 12, characterized in that the heat emitting appliance (210, 210') is configured as a lidar sensor.

14. Vehicle according to claim 12 or 13, characterized in that the heat emitting appliance (210) is arranged at the front of the vehicle, in particular in the region of a bumper (205) of the vehicle (200), or on the roof (207) of the vehicle (200).

15. Environmental sensor (300), in particular lidar sensor, in particular for use in a vehicle (200), having at least one cooling device (1a, 1b) according to any of claims 1 to 10.

16. The environmental sensor (300) according to claim 15, having a housing (310), characterized in that a heat exchanger (20) of at least one cooling device (1a, 1b) is connected in a form-fitting manner to the housing (310) of the environmental sensor.

17. The environmental sensor (300) according to claim 15, having a housing (310), characterized in that at least one face (312, 314) of the housing (310) forms a heat exchanger (20) of at least one cooling device (1a, 1 b).